213456012169 has 3 divisors (see below), whose sum is σ = 213456474183. Its totient is φ = 213455550156.

The previous prime is 213456012157. The next prime is 213456012179. The reversal of 213456012169 is 961210654312.

The square root of 213456012169 is 462013.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 91104367225 + 122351644944 = 301835^2 + 349788^2 .

It is not a de Polignac number, because 213456012169 - 2⁵ = 213456012137 is a prime.

It is a super-2 number, since 2×213456012169² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213456012179) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 231007 + ... + 693019.

It is an arithmetic number, because the mean of its divisors is an integer number (71152158061).

Almost surely, 2^213456012169 is an apocalyptic number.

213456012169 is the 462013-rd square number.

213456012169 is the 231007-th centered octagonal number.

It is an amenable number.

213456012169 is a deficient number, since it is larger than the sum of its proper divisors (462014).

213456012169 is an frugal number, since it uses more digits than its factorization.

213456012169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924026 (or 462013 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 213456012169 in words is "two hundred thirteen billion, four hundred fifty-six million, twelve thousand, one hundred sixty-nine".